Solved! Go to Solution.
<viewer:WidgetTemplate id="wTemplate">
<s:Rect bottom="0"
left="0"
right="0"
top="0">
<s:stroke>
<mx:SolidColorStroke
alpha="{getStyle('borderAlpha')}"
color="{getStyle('borderColor')}"
weight="1"/>
</s:stroke>
<s:fill>
<s:SolidColor alpha="1" color="0xffffff"/>
</s:fill>
</s:Rect>
<esri:Legend id="myLegend"
width="100%" height="100%"
top="10"
respectCurrentMapScale="{respectCurrentMapScale}"/>
</viewer:WidgetTemplate>